<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 200px;
            height: 150px;
            border: 1px solid #cd6969;
        }
    </style>
</head>
<body>
    <button>点击发送请求</button>
    <div id="res"></div>
    <script>
        const btn = document.getElementsByTagName('button')[0]
        const result = document.getElementById('res')
        btn.addEventListener('click', function(){
            const xhr = new XMLHttpRequest()
            xhr.open('GET', 'http://localhost:8000/ie?t='+Date.now())
            xhr.send()
            xhr.onreadystatechange = function(){
                if(xhr.readyState === 4){
                    if(xhr.status>=200 && xhr.status<300){
                        result.innerHTML = xhr.response
                    }
                }
            }
        })
    </script>
</body>
</html>